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Author Message   Izakwould Posted on Wednesday, May 11, 2005 - 05:00 pm:        Does anyone know the speedo drive ratio for an S2 Thunderbolt off the top of their head? Thanks.   Firemanjim Posted on Wednesday, May 11, 2005 - 09:20 pm:        Its a HD part so its whatever they use.Just remembered it was hard to find an aftermarket speedo that went higher than stocker.So its different than the jap/euro bikes.   Aaomy Posted on Wednesday, May 11, 2005 - 09:38 pm:        the only help i can give is that the drive unit on the wheel is a stock sportster part,(67127-84A).. this fits 84-94sportsters, fx, fxr, and 94-95 dyna glides with 19" narrow fronts.. of course s2 also..and they list it as a 2:1 ratio..this is the only book info i can find.. so please take it just as that.. hope some of i may help you on your quest.   Phat_j Posted on Wednesday, May 11, 2005 - 11:50 pm:        kinda funny how a 19 in and a 17 in have the same ratio... but mine is extreamly accurate, as at 86mph, i'm registering 85.. this was verified by local authoraties just the other day...   Izakwould Posted on Thursday, May 12, 2005 - 11:51 pm:        I haven't been able to verify yet, but it seems like the speed registering on my speedo is a bit faster than actual speed. The speedo I put on had a 2:1 ratio and supposedly fits front wheel drive FL, FX, FXR & Sportster 1981/1984 (except Softail & FXWG). I'm wondering if the speedo would register a faster speed since my Buell has a smaller wheel diameter than the above models. For example, when I'm doing what I think is about 80mph, the speedo is registering 100mph or more...   Phat_j Posted on Friday, May 13, 2005 - 12:21 am:        well your weel is larger than the 16" fl, and smaller than the 19 in fx..... definatly smaller than the 21" wide glide models..   Sportyeric Posted on Friday, May 13, 2005 - 12:26 am:        I think the speedos for different models have different internal ratios. My Sporty got one from an FX and reads 10 percent slow.   Jackbequick Posted on Sunday, May 22, 2005 - 10:00 am:        Interesting thread, a lot of people have access to a handheld GPS and those are great for checking speedometers. Up to 300 mph or so anyway. Get a fix, go to a screen with the large speed readout, and take a ride. You can usually find a way to attach the GPS to the bars or somewhere with a bungee or tape for a brief test. As always, the deal is to do it somewhat in light traffic and don't get preoccupied with looking at the GPS.

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